Improvement in moulding gear-wheels



WARREN ROVVELL,l OF NEW YORK, N.. Y., ASSIGNOR TO HIMSELF AND JOHNHECKER, OF SAME PLACE.

Lette/rs Patent No. 84,305, dated November 24, 1868.

To all whom it may conce/ra Be it known that I, WARREN ROWELL, of thecity,

county, andState of` New York, have invented a new and usefulImprovement in the Method of Moulding Double-Gear W heels; and I herebydeclare that the following is a full and exact description of myimproved method, reference being had to the accompanying drawings,forming a part of this specication, in which- Figure 2 is a face view ofone side of the plate, with the patterns attached thereto.

Figure 1 is an elevation.

Eigure 3 is a section through the line X'X.

Figure A is 'a perspective view`of the castings when completed.

Similar letters of reference indicate corresponding parts in all thefigures. v

lhe castings which I produce by my method are the' peculiar castingsdescribed in my patent dated September 3, 1867, for use in gearing therolls of clothesywringing machines. It is impossible to cast these byany ordinary process without the aid of a core. My invention casts themwithout the aid of a core.

The diiculty lies in the production of the groovelinev of the gear, andan exterior diameter, somethingl greater than the extreme points oftheteeth, it being understood, of course, that the port-ion extendingbeyond the tee-th is for the purpose of taking hold in the sand, of themould, to hold the inner and useful portion of the core in place.

I have discovered thatby skilfully dividing such core in to parts, andattaching the parts alternately, lirst `to the one part of the mould,and then to the other,

the core thus divided will perform the same as usual. And I havediscovered that the core thus divided gives a form of the parts whichmay be moulded in green sand entirely, without involving any more laboror skill than that possessed by the ordinary moulder. In other words, Ican by this means make the core, if it so be called, in green sand, as apart of the ordinary green` sand mould, care being taken, in forming thepattern, to make the alternate divisions of the part corresponding tothe core, and which I call the greensand core, carefully adapted to eachother, so as to match perfectly together.

I have made, also, some improvements in the means of carrying out myinvention.

It may he said that my invention consists in certain novel means ofcausing the spaces between the teeth, in the direction ofthe line oftheaxes of the wheels, to be produced without the aid of, and therebysaving the labor of making a dry-sand core, so that when the two sidesof' the plate or plates having corresponding sides have been moulded on,and the two moulds put t0- gether, the casting produced shall be thesame as that now produced by the dry-sand cor.

In order to do this, I recess the plate to the depth of one-half theusual dry-sand core, then take a ring, shown in section at O, fig. 3,that shall t the recess in the plate, and rise abovethe plate thesameheight, or nearly, and divide it into twice the number of parts asthere are teeth in the Wheel.

I place in the recess under each toothin the wheel, n

shown in plan, fig. 2, a', a", Sac., one ofthe said parts, care beingtaken to have eachportion of the ring so bevelled that it shall leavethe sand readily.

As both sides ofthe plate, with the pattern attached, or the two sidesof corresponding plates are nearly alike, only one side ofthe plate andone-half pattern are shown in' the drawings.

By nicely adjusting the plate to the flask in which the sand is moulded,and the pattern or half pattern properly adjusted to the plate, oneplate is sucieut to mould the two sides ofthe dask .by turning over theplate.

In order to allow for a lateral motion'of the pattern in regard to theplate, I leave a space between the plate and pattern, shown at e e, iig.l, and place therein an elastic material, so that on rapping the plateon its al# ternate sides and ends, the patterns, on being moulded, areloosened in the sand, and thereby are the more readily withdrawn withoutmarring the sand, the elas' tic material fitting so close as not toallow the sand to get in the joint, but still not having lateralpressure enough to overcome the weight of the pattern, the pattern beingattached to the plate in any suitable manner to allow of this lateralmotion.

It may, however, be convenient to have the patterns so attached to theplate that in order to withdraw-them yfrom the sand the pattern willleave the plate on being moulded, and remain in the sand on liftingofftheplate, and then be withdrawn. In this case the elastic materialmay be dispensed with, and the pattern loosened in the sand, by rapping,as is ordinarily done.

As the circumstance of asks and sand is s0 well known to moulders, it isnot necessarily shown.

In order to diminish the cost of patterns when more than one is wanted,I make asuitable metal pattern, with a portion of the plate attached, (acircular portion preferred,) and multiply them by theelectrotypeprocess, and recess the main moulding-plate, as shown in thedotted line a n, iig. 1 and iig. 3, and place the eleetrotype patternsin thesaid recesses. By this means from one to ten 0r more Wheels can bemoulded at one time.

What I claim as my invention, amd desire to secure l. Moulding mydouble-gear wlieel-Awith the groove between the two series of teeth, byin eeet dividing the core into parts or steps, and mounting the partsalternately in the opposite asks, and forming them of green send at thesame time the main parts are formed, substantially its for the. purposesherein set forth.

2. The introduction of an elastic-substnnee between the pattern :undplate, as described Witnesses ALFRED HOWELL, EDW. HOWELL.

WARE

EN HOWELL.

